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Annotation of XNU/bsd/kern/parallel.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
                      3:  *
                      4:  * @APPLE_LICENSE_HEADER_START@
                      5:  * 
                      6:  * The contents of this file constitute Original Code as defined in and
                      7:  * are subject to the Apple Public Source License Version 1.1 (the
                      8:  * "License").  You may not use this file except in compliance with the
                      9:  * License.  Please obtain a copy of the License at
                     10:  * http://www.apple.com/publicsource and read it before using this file.
                     11:  * 
                     12:  * This Original Code and all software distributed under the License are
                     13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
                     14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
                     15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
                     16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
                     17:  * License for the specific language governing rights and limitations
                     18:  * under the License.
                     19:  * 
                     20:  * @APPLE_LICENSE_HEADER_END@
                     21:  */
                     22: /* 
                     23:  * Mach Operating System
                     24:  * Copyright (c) 1989 Carnegie-Mellon University
                     25:  * Copyright (c) 1988 Carnegie-Mellon University
                     26:  * Copyright (c) 1987 Carnegie-Mellon University
                     27:  * All rights reserved.  The CMU software License Agreement specifies
                     28:  * the terms and conditions for use and redistribution.
                     29:  */
                     30: /*
                     31:  * HISTORY
                     32:  * 
                     33:  * Revision 1.1.1.1  1998/09/22 21:06:13  wsanchez
                     34:  * Import of Mac OS X kernel (~semeria)
                     35:  *
                     36:  * Revision 1.1.1.1  1997/09/30 02:44:39  wsanchez
                     37:  * Import of kernel from umeshv/kernel
                     38:  *
                     39:  * Revision 2.4  89/12/22  15:52:48  rpd
                     40:  *     MACH_HOST support: when releasing master, context switch away
                     41:  *     immediately if thread is not assigned to default processor set.
                     42:  *     [89/11/16            dlb]
                     43:  * 
                     44:  * Revision 2.3  89/10/11  14:19:20  dlb
                     45:  *     Processor logic - explicitly record bound processor in thread
                     46:  *     instead of changing whichq pointer.
                     47:  *     [88/09/30            dlb]
                     48:  * 
                     49:  * Revision 2.2  89/02/25  18:07:24  gm0w
                     50:  *     Changes for cleanup.
                     51:  * 
                     52:  * 15-Oct-87  David Golub (dbg) at Carnegie-Mellon University
                     53:  *     Use thread_bind (inline version) to bind thread to master cpu
                     54:  *     while holding unix-lock.
                     55:  *
                     56:  *  9-Oct-87  Robert Baron (rvb) at Carnegie-Mellon University
                     57:  *     Define unix_reset for longjmp/setjmp reset.
                     58:  *
                     59:  * 25-Sep-87  Robert Baron (rvb) at Carnegie-Mellon University
                     60:  *     Clean out some debugging code.
                     61:  *
                     62:  * 21-Sep-87  Robert Baron (rvb) at Carnegie-Mellon University
                     63:  *     Created.
                     64:  *
                     65:  */
                     66: 
                     67: 
                     68: #include <cpus.h>
                     69: #include <mach_host.h>
                     70: 
                     71: #if    NCPUS > 1
                     72: 
                     73: #include <kern/processor.h>
                     74: #include <kern/thread.h>
                     75: #include <kern/sched_prim.h>
                     76: #include <kern/parallel.h>
                     77: 
                     78: void unix_master()
                     79: {
                     80:        register thread_t t = current_thread();
                     81:        
                     82:        if (! (++( t->unix_lock )))     {
                     83: 
                     84:                /* thread_bind(t, master_processor); */
                     85:                t->bound_processor = master_processor;
                     86: 
                     87:                if (cpu_number() != master_cpu) {
                     88:                        t->interruptible = FALSE;
                     89:                        thread_block(0);
                     90:                }
                     91:        }
                     92: }
                     93: 
                     94: void unix_release()
                     95: {
                     96:        register thread_t t = current_thread();
                     97: 
                     98:        t->unix_lock--;
                     99:        if (t->unix_lock < 0) {
                    100:                /* thread_bind(t, PROCESSOR_NULL); */
                    101:                t->bound_processor = PROCESSOR_NULL;
                    102: #if    MACH_HOST
                    103:                if (t->processor_set != &default_pset)
                    104:                        thread_block(0);
                    105: #endif MACH_HOST
                    106:        }
                    107: }
                    108: 
                    109: void unix_reset()
                    110: {
                    111:        register thread_t       t = current_thread();
                    112: 
                    113:        if (t->unix_lock != -1)
                    114:                t->unix_lock = 0;
                    115: }
                    116: 
                    117: #endif NCPUS > 1

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